2PCS Diamond Grinding Wheel Set: Double Row + Turbo Row Comes with 2Pcs 115mm (4-1/2 Inch) grinding wheels, with 22mm (7/8 Inch) arbor hole and 5mm diamond segment thickness, fit for 4-1/2" Angle Grinder.Package Included: 1 x turbo row segment diamond grinding wheel, 1 x double row segment diamond grinding wheel. Premium Diamond Material Our diamond grinding cup wheels are made of heat-treated steel body and high concentration of diamond, which provide long durability and aggressive material removal performance. Fast Grinding Performance Provide long durability and aggressive material removal performance. Fast grinding & polishing effect on masonry, stone, and concrete. Exhaust Hole Design It features air holes designed to maintain and cool the cutting pattern, reducing wear and improving the work efficiency. Two Reducing Rings 2Pcs steel rings (22mm to 16mm(5/8"), 22mm to 20mm), reducing the arbor diameter to achieve more compatibility with different angle grinders. Use for Dry/Wet Grinding On Various Material Surfaces The diamond grinder cup wheel allows quick and smooth material removal, ideal for grinding material like concrete, granite, stone, marble, tile, cement, masonry. Suitable for angle grinders to remove thinset and excess materials on the surface quickly.